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JS
03-08-2001, 09:42 AM
" Anybody use synthetic oil in your marine engines?
If so, what brand and weight? "

Dan Dillon
09-21-2001, 11:43 PM
" Yeah, Mobil 1 15/50
Worked well in my 1986 Chris Craft 312 Stinger. Twin Mercruiser 454/330hp.
Try the same oil in my new boat (new to me) 35 Cigarette Mistress with twin 454/450hp and it would burn it up. Now I use SAE 40 and it doesn't burn. It is also 1/3 of the cost of the Mobil 1. It adds up when changing the oil once every twenty hours. I was told this has to do with the multi-viscosity that it would burn. Mercury recommends straight weight oil too.
All depends what your running I guess.
Hope this helps. "